Lathe and drill chuck.



No. 772,737.. PATENTED OUT. 18, 1904,

0- M-UMOWAT'. .7 Y I I LATHE AND DRILL 0mm.

. APPLIOATION FILED T13R27. 1903. N0 MODEL.

Patented October 18, 1904.

P TE T OFFICE.

OLIVER M. MOWAT, or MOKEESPORT, PENNSYLVANIA.

LATHE AND DRILL CHUCK- SPEGIFIGATION forming part of Letters Patent No.772,737, dated October 18, 1904. y

Application filed February 27, 1903. Serial No. 145,380. (No model.)

To a, whom it may concern: I

Be it known that I, OLIV R M. MowA'r, a citizen of the United States ofAmerica, residing at McKeesport, inthe county of Allegheny and State ofPennsylvania, have in useful improvements in lathe and drill chucks,

and relates particularly to that class of chucks in which the drill isheld'by adjustable jaws.

The invention has for its object to construct a drill and lathe chuck ofthe above-described class with a plurality of alining-jaws and a pair ofdriving-jaws, which latter engage and positively drive the drill of anysize within the range of the alining-jaw's.

- A still further object of the invention is .to

construct a drill and lathe chuck which will not only aline the drill ona portion thereof which lies within the jaws; but also aline the drillat the point where driven, thus assuring the positive alinement of thedrill. Briefly described, my invention comprises,

i in connection With the body of the'chuck, a

pair of oppositely-disposed aiming-jaws, each of which jaws hasstaggered teeth, the inclined faces ofwhich are at reverse angles toeach other, and a pair of oppositely-disposed driv ing-jaws having teethfor engagement with the flattened opposite faces of the drill. The

jaws are adjusted to move thesame toward or away from the center,whereby to grip the drill or release the same by the annularadjusting-ring, having a threaded portion for engagement with thethreaded surface of the respective jaws.

In describing the invention in detail reference 1s had to theaccompanying drawings, forming a part of this speclfication, and-Where 1is a horizontal sectional view. Fig. 5 is a detail perspective view ofone of the aliningjaws and-one of the driving-jaws detached from thechuck and shown in their relative position to each other.- Fig. 6 is aplan view of a part of a drill.

In the accompanying drawings, 1 indicates the cylindrical-body of thechuck, which-in practice is preferably constructed with a substantiallycylindrical extension 2 of less diameter than the body 1 and which iscored out or hollowed to afford means of adjust ment to thespindle ofthe lathe.

Sleeved onto' the body portion 1 and revolubly secured thereon in theusual manner, as by a set-screw and peripheral groove, is theadjusting-ring, 3, having the annular body portion 1, provided at itsinner face with threads 5, and having an annular recess in which isseated the face-plate 6, which is suitably secured'to the ring by screws7 or in any other suitable manner. This face-plate is provided with asuitable opening in order to permit the entrance of the drill inposition-in the jaws, and the cylindrical body 1, the"an nularadjusting-ring 3, and the face-plate 6 constitute the framework of thechuck, the saidadjusting-ring and face-plate being rotatable in unisonon the annular body 1.

Mohnted within the chuck and surrounded by the adjusting-ring 3 are apair of oppositely-disposed driving-jaws. Each alininga 'jawcomprisesthe block-like section 8 and a right-angular extending memberg, theouter 'face of the blockor body portion 8 of the alining-jaw havingthreads lOto be engaged by the threads 5 of the adjusting ring. Formedon the'right angular or horizontallyextending portions 8 ,of thealining-jaws are inclined teeth '11 12, which are staggered with respectto each other, and the inclined faces of each set of teeth are atreverseangles to the other. The.;t wo alining-jaws are placed opposite to eachother, and placed at right angles to these two alining-jaws and workingin and out in unison therewith are the driving jaws 14, havingdovetailed heads 15, whichwork in grooves 16,'pro vid,ed therefor in thebody of the chuck. The driving-jaws the adjusting-ring. The driving-jawsare each provided with a tooth 18, the inclined face of which is at agreater angle to the sides of said driving-jaws than the incline on theface of the teeth 11 and 12, and the two driving-teeth 18 of the twodriving-jaws are adapted to engage with the flattened faces 19 of thedrill 20. The drill, the diameter at the flattened portions of whichbear such relation to the diameter of the drill as will permit the twosets of jaws to clamp it simultaneously, is placed in position byspreading the jaws. which is accomplished by the turning of theadjusting-ring in one direction. After the drill has been insertedbetween the alining-jaws, the adjusting-ring is turned in the oppositedirection, which moves the alining-jaws toward each other andsimultaneously moves the driving-jaws, so as to engage the driving-teeth18 thereof with the flattened portions of the drill. Each of thealining-jaws, it will be observed, engages with the periphery of thedrill at four points thereof, firmly alining the drill in the chuck,while the driving-teeth of the driving-jaws engage with the flattenedportions of the drill and positively d rive the same. It is to be notedthat the driving-teeth as will be observed by reference to Fig. 1,engage the flattened portions of the drill simultaneously with theengagement of the periphery of the drill by the alining-teeth, thisbeing possible by reason of the inclined face of the driving-teeth beingon a plane beyond the incline face of the one row of alining-teeth ofeach of the alining jaws. In other words, the angle of the driving-teethis greater than the angle of the alining-up teeth, whereby when theadjustingring is turned to simultaneously move the four jaws toward eachother the driving-teeth engage with the flattened portions of the drillsimultaneously with the engagement of the alining-teeth with theperiphery or body of said drill.

WVith this construction it is to be noted that I not only positivelydrive the drill, but I aline the same so as to positively hold inalinement at all times, and 1 not only aline the drill between thealining-teeth of the jaws, but I aline the same at the point wheredriven, assuring the positive alining of the drill from end to end ofthe jaws and the firm holding of the same. I also desire to callattention to the fact that the point where the screw of theadjusting-ring engages with the screw or threads of the jaws is aboutmidway of the length of said jaws, so that the driving pressure whenmoving the jaws against the drill is practically evenly divided.

It will be noted that various changes may be made in the details ofconstruction without departing from the general spirit of my invention.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In combination with the chuck-bod y ha ving twoperpendicularly-disposcd diametrieal slots, the first of which isundercut, an adjusting-ring sleeved on said body and having an interiorchamber at its rearward end and a reduced opening at its forward end,the forward face of said chamber being provided with a spiral scroll,oppositely-disrmsed alining-jaws having inclined and staggered teeth andprovided with a scroll engaging said spiral scroll and working in thesecond of said slots, a pair of driving-jaws also in engagement withsaid spiral scroll and having heads engaging the said undercut slot anda single tooth carried by each of said driving-jmvs having a faceinclined at a greater acute angle to the sides of said driving-jaws thanthe inclined teeth of said alining-jaws.

2. In a chuck, the combination of a body part havingdiametrically-disposed slots, a set of gripping-jaws and a set ofdriving-jaws, the grippingjaws having each two sets ofoppositely-inclined teeth and the driving-jmvs having each a singletooth, and means for simultaneously moving all the said grippingjaws anddriving-jaws toward or from the central axis of the chuck, comprising aring sleeved on said body and having a scroll in engagement with ascroll on each of said jaws.

In testimony whereof I aiiix my signature in the presence of twowitnesses.

OLIV ER M. MO W Al \Vitnesses:

H. C. EVERT, A. M. \VILsoN.

